I am running a 93 race tune and i put in 89 octane by mistake. I drove the car aroudn for a few days( iknow dumb) i kept it under 3k rpm, and car ran fine. As soon as I heard knocking i changed bakc to 87 tune. Could I have possibly damaged my engine badly. Car seems to be running fine. Do yuo guys think I damaged the engine?

 

im sure you'll be fine.....i've been there before switching tunes... had to try them all . but im on 93 to stay now. i wish the sct2 could tell you which tune you had at any given time.